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Clamp On Flow Meter Endress Hauser: Proline Prosonic External Spool Specs
Quick Answer: The Endress Hauser Proline Prosonic clamp-on flow meter with external spool typically covers DN25 to DN300 as a standard range and can be custom built up to DN1200. Common external spool specs include 316L stainless steel or carbon steel body, PN16 or Class 150 flanges, fluid temperature from -40 °C to 150 °C, and outputs such as 4-20 mA HART, pulse, and Modbus RTU. Silver Automation Instruments supplies a clamp-on ultrasonic flow meter with a similar external spool design for water, wastewater, chemical, and cooling systems.
Buyers often search for this product because the external spool removes some field installation risk. The spool is a straight pipe section with flanges. The transducers are mounted on the outside of the spool in the factory. That means sensor spacing stays fixed and the pipe surface is clean. In practice, this reduces setup errors on site.
External Spool Dimensions and Materials
A DN50 external spool is often around 200 mm long. A DN100 spool is around 250 mm long. A DN150 spool is around 300 mm long. These lengths can change by supplier and flange pressure class. The spool material is usually 316L stainless steel or carbon steel with epoxy coating. Flange standards include EN 1092-1 PN16 and ANSI B16.5 Class 150. Other flange ratings such as PN40 or Class 300 are available for higher pressure lines.
The Proline Prosonic external spool sensor is not wetted. The clamp-on transducer blocks sit on the outside surface. This allows the same meter to work on corrosive liquids if the spool material and gasket material are compatible. The acoustic coupling pads are selected by temperature.
Proline Prosonic Clamp-On Performance Data
For a Prosonic clamp-on flow meter with an external spool, accuracy is often quoted at 0.5 percent of reading under stable factory conditions. Field accuracy of 1.0 to 1.5 percent is more common when the pipe has short straight runs or low flow below 0.3 m/s. Here is the thing about accuracy. The external spool gives a cleaner signal path than direct field mounting because the pipe surface is prepared and the sensor spacing is fixed.
Standard transducers handle process temperatures from -40 °C to 130 °C. High-temperature coupling pads extend the range to 150 °C. The transmitter accepts 18 to 36 VDC or 85 to 250 VAC depending on the order code. Common outputs include 4-20 mA HART, pulse frequency, and Modbus RS485. Some models support Modbus TCP
Common Buying Scenarios for External Spool Meters
A water utility in the Philippines asked for a DN200 clamp-on meter for a buried raw water line. They needed PN16 flanges, a remote transmitter, and a 20 meter sensor cable. The replacement from Silver Instruments used a 316L stainless steel spool and ultrasonic transducers with IP67 housings. The meter was installed after a 10D straight run and held within 1.0 percent of the reference flow.
Another customer in Saudi Arabia needed a DN80 spool-type meter for cooling water at 95 °C. The standard coupling pads were replaced with high-temperature pads. The output was 4-20 mA HART to the plant PLC. The order included a calibration certificate and a pressure test report for the spool.
Quote Request for a Clamp-On External Spool Flow Meter
If you want a price for a DN100 clamp-on flow meter with an Endress Hauser style external spool, send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. We will quote the Silver Instruments equivalent or a spool meter with 4-20 mA HART, Modbus RTU, and the flange standard you need.
Contact Silver Automation Instruments for technical selection or a budget price.
Tel: +86-25-68650347
Whatsapp: +86-25-52155837
WeChat: +86 15365082610
Website: flow-meter.com.au
FAQ
1. What pipe sizes does an Endress Hauser Proline Prosonic external spool clamp-on meter cover?
Standard external spool configurations cover DN25 to DN300. Custom spool pieces can reach DN1200 for water and wastewater lines.
2. What is the typical accuracy of a clamp-on spool flow meter?
Factory spool reference accuracy is around 0.5 percent of reading. Field accuracy of 1.0 to 1.5 percent is expected under real installation conditions.
3. Which output signals are available?
Common outputs are 4-20 mA HART, pulse frequency, and Modbus RS485. Some models support Modbus TCP or wireless adapters.
4. Can the external spool meter be used on hot water or steam lines?
The clamp-on meter works on liquids. Hot water is fine up to 150 °C with high-temperature pads. Steam is not supported because the ultrasonic signal needs a continuous liquid medium.
5. How fast can Silver Instruments supply a replacement spool-type ultrasonic flow meter?
Many DN50 to DN300 units ship in one to two weeks after drawing approval. Custom large spools may take three to five weeks.
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